Mold cooling device for line casting machines



Aug. 9, 1938. c. c. cox ET AL" MOLD COOLING DEVICE FOR LINE CASTING MACHINES 2 Sheets-Sheet 1 Filed Oct. 7, 1936 III IlIlIlII IIII IIII III! (I INVENTOR5. 1-132 (oz and ATTORNEYfi'.

Aug. 9, 1938. c. c. cox ET AL MOLD COOLING DEVICE FOR LINE CASTING, MACHINES Filed Oct. 7, 1936 2 Sheets-Sheet 2 INVENTORJ,

Cal-1 C Cox arm! Patented Aug. 9, 1938 UNiTED STATES PATENT OFFICE.

MQLD COOLING DEVICE FOR LINE CAST- ING MACHINES 3 Claims.

The present invention relates to improvements in line casting machines and has particular reference to machines of the type usually referred to in commercial art as the Linotype machine or the Intertype machine, although the invention is applicable to other types of machines having substantially the same characteristics.

In machines of this character there is usually provided a mold disc provided with one or more mold cavities therein which extend from the face of the disc to the rear of the disc.

In addition to this mold disc there is provided what is known as a vise, in the commercial art, which is hinged at its lower end and, during normal operation is held by suitable hand screws at its upper end in direct proximity to the face of the mold disc. This Vise carries the matrices against which the metal is forced for the purpose of making the type and also carries trimming knives, which are arranged on either side of an ejector opening in the vise and through which opening the cast slug is adapted to be ejected after the cast has been made.

The mold disc during the molding operation is adapted to be placed in communication with the metal pot in which the molten metal is adapted to be contained to receive from the metal pot a proper supply of molten metal for casting a slug.

One of the difficulties heretofore experienced in casting Linotype or Intertype slugs and the like is that due to the rapid operation of the machine the mold in the mold disc becomes so heated, from frequent injections thereinto of the hot metal during the cast, that the metal when forced into the mold is not properly cooled. As

a result, when the metal does not take a quick set, due to the suction effect of the plunger in the metal pot, there is a tendency for the metal in the mold to be drawn back into the metal pot. This of course results in a skeleton slug instead of a solid slug. Furthermore, where the metal is not quickly and properly cooled the resultant 1 slug is porous and soft and is apt to become damaged when the slug is ejected from the mold cavity by the operation of the ejector blades.

set as soon as the molten metal is delivered to the mold cavity.

As a result of the maintenance of the mold cavity and its surrounding walls in a cooled condition, not only is it possible to obtain a more solid slug but it is possible to obtain the slug without varying the temperature of the metal in the metal pot or mouth piece. The mold disc as a rule has one or more mold cavities therein of different sizes so that different size slugs may be cast. Obviously, without means for cooling the molds, it would be necessary to change the temperature of the metal in the pot or mouth piece when changing from large to small or from small to large slugs, as the case may be, to compensate for the variation in the heat of the mold. The difficulty is, not that the metal in the pot really gets too hot but that the mold becomes so heated by the repeated casting of hot metal in the same mold, that, due to the increasing heat of the mold itself, the metal will not be cooled quickly enough to cause the slug to be properly cast. By maintaining, through the medium of the present invention, the temperature of the mold cavity comparatively low, no adjustment need be made in the temperature of the metal pot or the metal contained therein.

For the purpose of disclosing the invention, certain embodiments thereof have been illustrated in the accompanying drawings. In said drawings,

Fig. 1 is a front elevation of a mold disc used on the Intertype machine;

Fig. 2 is a face view of the vise, looking at the same as it is let down on its bottom hinges from the mold disc;

Fig. 3 is a partial face view of the mold disc showing the position of the air delivering tube;

Fig. 4 is a diagrammatical view of a layout for supplying compressed air to the air tube;

Fig. 5 is an elevation of a modification of the invention wherein the air delivery means is em bodied in a trimming knife of the type adapted for use in connection with a Linotype machine; and

Fig. 6 is a similar view in connection with a trimming knife adapted for use in connection with an Intertype machine.

In the structure illustrated, the mold disc I is of the usual and standard construction now embodied in the commercial Intertype machine. This disc is provided with a series of openings in which the molds 2, 3, 4, and 5 are shown. As will be noted, these mold cavities are of different size for different size slugs and the disc is adapted to be rotated to present any selected mold to its casting position and ejecting position. In the structure illustrated the mold cavity 3 is in its casting position and the mold cavity 2 is in its ejecting position; the disc having been rotated between the casting position and the ejecting position approximately three-quarters of a turn.

Mounted on the vise l is a pair of trimming knives 8 and 9 which are usually in front of the ejector opening of the Vise. When the parts are assembled in operative position these trimming knives 8 and 9 are immediately opposite the mold cavity when the same is in its ejector position so that the slug may be forced out of the mold cavity by means of the ejector blades between the knives and through the ejector opening in the vise. During the passage between the knives the sides of the slug are properly trimmed. Due to the fact that these knives are adapted to cooperate with mold cavities of different widths, one of the knives, preferably the knife 9, is made laterally movable by the operator through suitable lnstrumentalities.

In order to properly cool the mold cavity, and incidentally, the slug as it is being ejected therefrom, we mount in a position adjacent the ejector position of 'the mold cavity an air delivery tube I. In order to accurately position this tube relatively to the mold cavity, the tube is provided with a pair of mounting lugs l2 which are adapted to be secured, by means of bolts or machine screws I 3 directly to the face of the ad justable knife 9. Thus the cooling tube is automatically positioned for all sizes of slugs. This air tube is provided with a series of openings l4 and so formed in the tube as to direct the air against the body of the mold and into and through the mold cavity or cell. As a result, air under compression is forced into the cavity to quickly chill or cool the cavity after the ejection of the slug. Furthermore, during the ejection of the slug air is delivered against the slug and the surrounding parts of the mold.

We have discovered, as a result of rather extensive experiments, that this air should be, to accomplish satisfactory results, clean, free from moisture, and free from oil. It should be perfectly dry and of course free from dust to prevent the accumulation of dust, moisture, or oil in the mold cavity which, of course, would prevent a perfect formation of a slug and would also transmit oil and moisture to the more delicate mechanism of the machine which of necessity must be kept from these elements at all times. To this end, we provide means for filtering the air before it is delivered to the tube.

In actual practice, in addition to the tube, which is mounted as above described, we also mount on the machine, adjacent the operator, an air-controlling valve l5 which is connected by a suitable flexible conduit IS with the air delivery tube II. This flexible tube permits the stationary mounting of the control valve l5 and at the same time so connects the valve with the tube as to permit relative movement between the tube and the valve, thereby permitting the opening and closing of the vise without disturbing the parts. The valve I5 is connected by a conduit IT with an air filter I 8 preferably mounted on some stationary part of the machine itself, although this is not essential, while being desirable. This filter I8 is connected by a conduit l 9 with a master filter 20 which may be mounted in some part of the building and from which various branches may be taken for the purpose of delivering compressed air to a number of machines located in the building. The master filter 20, of course, is suitably connected with a supply of compressed air which may be in the form of an electrically driven compressor or any other desired source.

By the provision of the control valve IS the proper quantity or fiow of air to meet varying conditions in the machine may be controlled by the operator without changing his position.

If desired, instead of mounting a separate tube on the adjustable knife, as illustrated in Fig. 2, provision may be made whereby air is supplied through the knife itself. To this end a knife, as illustrated in Fig, 5, may be provided, which is provided with a longitudinally extending opening communicating with air delivering openings 21 corresponding to the openings l4 in the tube ll. These openings are so directed as to deliver the air to the mold cavity in the same manner as they are delivered by the separate tube, as illustratedin Fig. 2. The knife may be connected by a conduit 22 and suitable coupling 23 with the air supply conduit 16. The specific structure of knife illustrated in Fig. 5 is adapted for the Linotype machine. In Fig. 6 we have illustrated a knife 24 likewise having openings 25 therein similar to the openings l4 and 2|. This knife is of the type used on the Intertype machine. In all instances, however, it will be noted that the air supply is delivered directly into the mold cavity so that it will reach the innermost recesses thereof and the air supply means is mounted to move with the adjustable knife so that the same relative position of the air supply will be maintained irrespective of the difference in size of the mold cavities positioned for use.

We claim as our invention:

1. In a line casting machine, the combination with a mold disc having a mold cavity therein, a vise associated with said disc and trimmer knives mounted on said vise, one of which is movable, of means carried by said movable knife for delivering air into said mold cavity.

2. In a line casting machine, the combination with a mold disc having a mold cavity therein, a vise associated with. said mold disc, trimmer knives mounted on said vise, one of which is adjustable, and an air-delivery conduit carried by said adjustable knife having a plurality of airdelivery openings directed toward said mold cavity and adapted to deliver air into said cavity.

3. In a line casting machine, the combination with a mold disc having a mold cavity, a vise associated with said disc, and trimmer knives mounted on said vise, one of which is adjustable, said adjustable knife having a conduit formed therein and extending longitudinally thereof and having a plurality of discharge nozzle openings extending from said cavity to the face of said knife and directed toward said mold cavity.

CYRIL C. COX. EARL L. PURDY. 

